Improvement in stove-pipe thimbles



-Uivr'rEio STATES PATENT OEEICE.

OSCAR B. BUTTLES, OF MILWAUKEE, WISCONSIN.

IMPROVEMENT IN SVTOVE-PIPE THIMBLES.

Specification forming part of Letters Patent No. 131,846, dated October1, 1872.

To all whom it may concern: j

Be it known that I, OscAE B. BUrTLEs, ot the city and Icounty ofMilwaukee and State of Wisconsin, have invented certain new and usefulImprovements in Cylinders or Thimbles for Stove-Pipe Holes; and I dohereby declare the folluwing to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawing making apart of this specification, in whichA Figure 1 represents in perspectivethe two heads of the cylinder or thimble divested of the jackets, andFig. 2 represents a section through the cylinder or thimble.

Partitions are commonly -made of studdin g four inches thick, and iioorsare generally made of joists of eight, ten, or twelve inches in depth,and two inches is generally allowed for lath and plastering.

It i's very desirable to have a at top and bottom to a stove-pipecylinder or thimble, so that the heads will be iiush with the plasterying; but this has not heretofore been accomplished without wasting moreor less of the tin from which the cylinders are cut. A thimble has beenmade with one iiat and one concave head, so that sheets of tin, as theycome to the market, may be used without waste; but this concave head isobjected to by many as unsightly.

The object and purpose of my invention are to have or make both of theheads or ends of the cylinder flat, and yet cut the cylinders fromsheets of tin of the marketable sizes without any waste; and myinvention consists in making a double iiange upon, or extending, one orboth of the cast'ron heads, so as to reduce the length of the tin forthe outer cylinf der and add to that of the inner cylinder, and

thus make both ends of the thimble flat and Y recess to receive the endof the outer cylinder or jacket d, the `iiangeb serving to extend thelength of the thimble when iinished. The inner portion of the head A isopen, as at B, and the perimeter of this opening is rounded oft', asseen at e, so that the end of the inner cylinder f may be turned downupon it. The other head C of the thimble has a recess or shoulder at gfor receiving the other end of the outer cylinder or jacket d, and arim, h., also rounded off, over which the opposite end of the innercylinder or jacket fis turned, and which inner cylinder, so turned overupon the edges of the rims or heads, holds the heads together, theshoulders e and g and the outer jacket d keeping the heads apart. Thehead C is also open through its center, as-at D, and between theopenings B D in said heads there is a series of holes, z' i, throughwhich air may circulate between the inner and outer jackets, and preventthem from heating.

With heads made as above the sheets of tin, of the sizes of which theyare made and put into the market, can be cut up and connected to themwithout any loss or waste, as follows: To make six-inch thimbles sheetsof tin twelve by twelve inches are used, and so cut that one piece shallbe five and a half inches for the outer and the other six and a halfinches for the inner cylinders, the inner ones turning over the edges ofthe cast-iron heads, and thus requiring greater length to allow for thisturning over. For a ten-inch cylinder sheets of tin fourteen by twentyinches are used, and so cut that one piece shall be nine and a halfinches for the outer cylinder and ten and a half inches for the innercylinder; and for a fourteeninch cylinder the same-sized sheetsviz.,fourteen by twenty inches-are used, cutting thirteen and a half inchesfrom one set of sheets for the outer and fourteen and ahalf inches fromanother set of the same-sized sheets for the inner cylinder, the oddhalf inch ofthe latter, as of the former inner cylinders, being used inturning the edges over the castiron heads. In this last case theremnants or pieces left will be iive and a half and six and a halfinches in width or length, whichever it may be called, and of the exactsize necessary for the six'inch cylinders, so that every particle ofthev tin is utilized. It is understood, of course, that enough of thesepieces are united to form the desired circumference of the cylinders. f

Having thus fully described my invention,

when I claim therein as new, and desire to secylinder f, and thus makingflat end cylinders cure by Let-ters Patent, is or thinlbles of differentlengt-hs Without waste A cylinder or thimble for stove-pipe holes oftin, as described and represented. composed of the flat annular heads AC, with a double enge, b c,or extension, on one or both, for receivingthe exterior short cylinder d and rims e h, for receiving the inner longOSCAR B. BUTTLES. Witnesses: f GoTTLrEB ENGEL, GEORGE DITTMAR.

